But POSIX shell sh which is part of UNIX standard is not that much less powerful (it's really not that much different than BASH). So you would have to get UNIX

But POSIX shell sh which is part of UNIX standard is not that much less powerful (it's really not that much different than BASH). So you would have to get UNIX group to break backward compatibility (of 40 years) and downgrade the shell to something less powerful. But why? We have had UNIX shells since 1972 and they work and work well for what they were designed. Also, the criticism of code style is unfounded. It was written ages ago to the standards of the day, tested to work and left alone as it should have (it works, works well and why touch it?). It may look strange to the people who have only started programming in the last couple of years and who would happily re-write every peace of working code to conform to their idea of coding standards and how things should be done.